Improvement in head-blocks



, THOMAS nou-GLASS.. Improvement in Headrocks. 'NQ, l2l,934 Patented Dec. 19,1871.

UNITED STATES THOMAS DOUGLASS, OF WARREN, OHIO.

IMPROVEMENT |N HEAD-BLOCKS.

Specification forming part of Letters Patent No. 121,934, dated December 19, 1871.

To all whom it 'may concern:

Be it known that I, THOMAS DoUGLAss, of Warren, in the county of Trumbull and State of Ohio, have invented certain new and useful Improvements in Machines for Dogging Logs, of which the following is a description, reference beinghad to the accompanying drawing making a part of this specification, in which- Figure 1 is a side view of the doggin g-machine. Fig. 2 is an edge view. Fig. 3 is a plan view.

Like letters of reference ref'er to like parts in the several views.

The nature of this invention relates to a device for dogging or holding logs while being sawed by a circular saw; and which device consists of an adjustable frame, having in one side a series of deep notches, in which the fulcrumeof a lever has its bearings. One end of said lever is projected through the frame, and the projecting end thereof is provided with a long sharp-pointed head or dog, which is forced into the side of the log for holding it by the opposite end of the lever, which is elevated for that purpose by means of a movable standard, as herein after more fully described.

This dogging device is applied to that class of saw-mills using a circular saw, against the side of which the log is dogged for being sawed; and, therefore, it differs materially from the dogging apparatus used inmills having saws of a vertical action.

In Fig. 1, A represents a section of a sill, and which may be of any desirable length, and is so arranged in its relation to the saw as to be at a right angle to the face thereof. The end B of the sill forms a pillow-block, on which one end of the log to be sawn lies. Said sill is adjustable in its relation of distance to the edge of the saw as the length of the log may require, and which log is indicated by the block C, Fig. 1. In the sill A referred to is cut a groove, in which is tted the base I) of the triangular frame E and standard F, so as to slide backward and forward therein for a purpose presently shown. The triangular frame E consists of two parallel sides,

as shown in Fig. 2, between which is inserted a lever, G, which is supported therein by means of a sleeve, H, through which the lever passes. Said sleeve is supported in the frame on trunnions a., projecting from each side and lodged in one of the pair of notches, I, as shown in Fig. 1, thereby suspending the lever in the frame, and at the same time allowing to it a rocking movement, and which sleeve also forms the fulcrum of the lever. To the iront end oi' the lever is secured a head or dog, J, Fig. 1., having a wedge-shape lower end, A. It will be observed that the face B of the frame stands perpendicular to the base and sill A 5 whereas the side of the frame having therein the notches, stands obliquely therewith, so that the sides of the series of notches have an inclination upward, as shown in Fig. 1, thereby giving a downward tendency to the sleeve. C is a standard or lever, the lower end of which is pivot-ed to the base D. Said lever also consists of two parallel sides, between which the outer end of the lever passes, and is guided in its ver tical movement. Said standard is perforated with holes for the insertion of the pin D.

The above described device is arranged in front of the saw at one side thereof. On the opposite side and corresponding therewith in position is arranged a similar device, both of which have the perpendicular side of the frame facing the saw, and in such relation to it that the ends of the sills A are in line with the face ofthe saw, or a little back therefrom, and which constitute the pillow-blocks on which the ends of the log rest, and the carriage on which the log is moved along or fed to the saw. The log is held in place on the blocks and close to the perpendicular side of the frame by the dog or head J. Thus, when the log is rolled into place on the blocks B the lever Gr is then so adjusted in some one of the notches I as to bring the lower end Al of the dog J upon it. For this purpose the outer end of the lever G is allowed to be depressed, more or less, as indicated by the dotted lines b, Fig. 1, in which position of the lever the standard is pushed forward to an oblique position, as indicated by the dotted lines c. The pin D is then inserted in some one of the holes immediately under the lever, as indicated by the point e. Now, on pulling the standard bac-k to a vertical position, as shown in Fig. 1, the end of the lever will thereby be carried upward, and thus force the end Al of the dogJ into the log O, and hold it hard down upon the pillow-block, and at the same time draw it close against the side of the frame, in which position it is held while being sawn.

This dogging apparatus is easily and readily adapted to any-size log by shifting the sleeve H and lever into either of the notches I, as the size of the log,r Ina-5' demand; and the log is moved along toward the saw for eneh successive out b v a log set so arranged in its relation to the (logging device and connected therewith as to move the base D along in the grooves of the sills A, in which they are fitted7 as above said. The two dogging' devices, being` operated simultaneously by thelog-set, move each end of the log at the same time and at the seine distance.

What I claim as myinvention, and desire to seeure by Letters Patent, is-

l. The lever G, dog or head J as arranged, in l 

